Teacher has a tuning fork. She showed us how to make a note with the tuning fork. To get a note you have to hold the fork between finger and thumb and hit the tuning fork hard off a hard object. The prongs of the tuning fork start to vibrate. Once the prongs of the tuning fork are vibrating, the fork can be turned over and the bottom is held against the table.
Now the vibration travels through the table and you can hear it reasonably loudly. Teacher had a c tuning fork. To get a different note you need a different tuning fork.When you put the vibrating prongs into a cup of water, the water vibrates and splashes out of the cup.
If you touch the vibrating tuning fork off a plastic container of rice or peas, the rice or peas jump with the vibration. 
If you hold the vibrating tuning fork against a ping pong ball that is hanging from a string, the ping pong ball will jump away from the fork. Each time it touches the fork it jumps away from it, sometimes with a big jump. 
These experiments looked so great.
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